Add progressive web app companion for cross-platform access

Vite + TypeScript PWA that mirrors the Android app's core features:
- Pre-processed shelter data (build-time UTM33N→WGS84 conversion)
- Leaflet map with shelter markers, user location, and offline tiles
- Canvas compass arrow (ported from DirectionArrowView.kt)
- IndexedDB shelter cache with 7-day staleness check
- Service worker with CacheFirst tiles and precached app shell
- i18n for en, nb, nn (ported from Android strings.xml)
- iOS/Android compass handling with low-pass filter
- Respects user map interaction (no auto-snap on pan/zoom)
- Build revision cache-breaker for reliable SW updates

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

pwa/node_modules/fast-uri/test/ajv.test.js

@@ -0,0 +1,43 @@
+'use strict'
+
+const test = require('tape')
+const fastURI = require('..')
+
+const AJV = require('ajv')
+
+const ajv = new AJV({
+  uriResolver: fastURI // comment this line to see it works with uri-js
+})
+
+test('ajv', t => {
+  t.plan(1)
+  const schema = {
+    $ref: '#/definitions/Record%3Cstring%2CPerson%3E',
+    definitions: {
+      Person: {
+        type: 'object',
+        properties: {
+          firstName: {
+            type: 'string'
+          }
+        }
+      },
+      'Record<string,Person>': {
+        type: 'object',
+        additionalProperties: {
+          $ref: '#/definitions/Person'
+        }
+      }
+    }
+  }
+
+  const data = {
+    joe: {
+      firstName: 'Joe'
+    }
+
+  }
+
+  const validate = ajv.compile(schema)
+  t.ok(validate(data))
+})